0. Pain in the APT- This program pesters people about available package upgrades, just like apticron or cron-apt. However, it does so by SMTP and XMPP (direct or MUC/conference room), not by calling mailx.

1. Imediff2- Imediff2 lets you merge two (slightly different) files interactively with a user friendly full screen interface on a text terminal. In other words, it is an ncurses based replacement for sdiff, written in Python.

11. High Availability in Debian- The project aims at coordinating the different development groups for the Pacemaker/Corosync HA cluster stack, including cluster-glue, libqb, resource and fence agents, crmsh, pcs/pcsd, and drbd.

12. aptitude- package manager with a number of useful features, including a mutt-like package matching syntax, dselect-like persistence of user actions, the ability to view the Debian changelog of most packages, and a command-line mode similar to of apt-get.

13. OVAL architecture- This project provides an OVAL agent, a central server to monitor agents and a set of scripts to generate OVAL descriptions based on Debian's security advisories to help administrators manage the security of Debian systems.

15. logcheck- The logcheck tool allows summeries of log file entries to be mailed to a system administrator via a cron job.
These summeries can alert the administrator(s) to any anomolous events upon the system, from errors with daemons to intrusion attempts.

19. ara- Ara is a command-line and GTK2 tool for searching the Debian package database. It provides sophisticated boolean regexp queries using an easy to use syntax and can call APT to install or remove selected packages.